glitch_filter.v

// Ownasaurus
// Designed to filter a signal to eliminate any tiny glitches, faking a rising/falling edge

module glitch_filter(
	input sys_clk,
	input line_in,
	output line_out
);

reg [3:0] sample_counter;
reg filtered_output;

initial begin
	filtered_output = 1; // arbitrary initial value of the output line
	sample_counter = 0;
end

always @(posedge sys_clk) begin
	if(filtered_output == line_in) begin // they match, so reset counter
		sample_counter <= 0;
	end else begin // the input signal has changed
		sample_counter <= sample_counter + 1'b1;
		if(sample_counter == 5) begin // they don't match, and it's been a a few samples. so let the change go through
			filtered_output <= !filtered_output;
			sample_counter <= 0;
		end
	end
end

assign line_out = filtered_output;

endmodule